Discover how to reset the engine light on your Infiniti M35 safely and effectively. This guide covers manual methods, OBD2 scanner use, and common causes so you can drive with confidence.
Key Takeaways
- Understand the engine light: The check engine light signals potential issues with your Infiniti M35’s engine, emissions, or sensors. Ignoring it can lead to costly repairs.
- Use an OBD2 scanner for accuracy: A diagnostic tool reads error codes and allows you to reset the engine light after fixing the underlying problem.
- Manual reset methods exist but are limited: Disconnecting the battery or using the gas pedal trick may work temporarily but won’t clear stored codes permanently.
- Address the root cause first: Resetting the light without fixing the issue will cause it to reappear. Always diagnose the problem before resetting.
- Regular maintenance prevents warnings: Keeping up with oil changes, air filters, and spark plugs reduces the chance of engine light triggers.
- Know when to see a mechanic: Complex issues like catalytic converter failure or transmission problems require professional diagnosis and repair.
- Infiniti M35-specific tips: This luxury sedan has unique systems—always consult your owner’s manual and use compatible tools.
How to Reset Engine Light & Infiniti M35: A Complete Guide
Seeing the check engine light pop up on your Infiniti M35 dashboard can be stressful. Is it a minor glitch or a serious problem? While the light doesn’t always mean disaster, it’s a signal that something in your vehicle’s engine or emissions system needs attention. The good news? Resetting the engine light on your Infiniti M35 is often straightforward—especially if you know what you’re doing.
In this comprehensive guide, you’ll learn exactly how to reset the engine light on your Infiniti M35, whether you’re using a professional OBD2 scanner, trying a manual method, or troubleshooting recurring issues. We’ll walk you through step-by-step instructions, explain why the light comes on in the first place, and give you practical tips to keep your luxury sedan running smoothly. By the end, you’ll feel confident handling this common automotive task—no mechanic required.
What Is the Check Engine Light?
The check engine light, also known as the malfunction indicator lamp (MIL), is part of your Infiniti M35’s onboard diagnostics system (OBD2). When the car’s computer detects a problem—such as a faulty sensor, emissions leak, or engine misfire—it triggers the light to alert you. The light can appear as either a solid glow or a flashing signal. A solid light usually means a moderate issue, while a flashing light indicates a severe problem that could damage the engine if ignored.
Visual guide about How to Reset Engine Light & Infiniti M35
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Common causes include a loose gas cap, oxygen sensor failure, catalytic converter issues, or spark plug problems. In the Infiniti M35, which features a powerful V6 engine and advanced electronics, even small glitches can trigger the light. That’s why it’s important not to panic—but also not to ignore it.
Why Reset the Engine Light?
You might want to reset the engine light for several reasons. First, after fixing the issue that caused the light to come on, you’ll want to clear the warning so you can confirm the repair worked. Second, if you’re preparing your Infiniti M35 for a smog test or vehicle inspection, the light must be off to pass. Third, a persistent light can be distracting and make it hard to notice new warnings.
However, resetting the light without addressing the root cause is like turning off a smoke alarm while the fire still burns. The light will likely return, and you risk further damage to your vehicle. Always diagnose and fix the problem first—then reset the light to confirm everything is working properly.
Tools You’ll Need
Before you begin, gather the right tools. The method you choose will determine what you need:
- OBD2 Scanner: The most reliable tool for reading and clearing error codes. Look for a basic code reader (around $20–$50) or a more advanced scanner with live data and code definitions.
- Owner’s Manual: Your Infiniti M35 manual contains model-specific instructions and fuse box diagrams.
- Basic Hand Tools: Screwdrivers, pliers, and a socket set may be needed to access the battery or fuse panel.
- Safety Gear: Gloves and safety glasses protect you when working under the hood.
- Clean Cloth: For wiping connections and terminals.
For most users, an OBD2 scanner is the best investment. It’s reusable, easy to operate, and gives you detailed information about what’s wrong with your car.
Method 1: Using an OBD2 Scanner (Recommended)
The most accurate and reliable way to reset the engine light on your Infiniti M35 is with an OBD2 scanner. This method reads the specific trouble codes stored in your car’s computer, helps you understand the problem, and allows you to clear the codes after repairs.
Step 1: Locate the OBD2 Port
The OBD2 port in your Infiniti M35 is typically located under the dashboard on the driver’s side. It’s a 16-pin connector, usually black or gray, and easy to spot once you know where to look. In most M35 models, it’s near the steering column, just below the knee panel. You may need to crouch down or use a flashlight to find it.
Step 2: Plug in the Scanner
Turn off the ignition, then plug the OBD2 scanner into the port. Make sure it’s securely connected. Some scanners power on automatically when plugged in; others require you to press a button. Wait a few seconds for the device to initialize and communicate with your car’s computer.
Step 3: Turn on the Ignition
Turn the key to the “ON” position (but don’t start the engine). This powers up the car’s electronics and allows the scanner to access the diagnostic system. The scanner screen should display a menu or prompt you to begin a scan.
Step 4: Read the Trouble Codes
Follow the scanner’s instructions to read the diagnostic trouble codes (DTCs). These codes—like P0420 (catalytic converter efficiency) or P0171 (system too lean)—tell you exactly what’s wrong. Write down the codes or take a photo for reference. Many scanners also provide plain-English explanations of the codes, which is helpful if you’re not familiar with automotive jargon.
Step 5: Fix the Underlying Issue
Before resetting the light, address the problem indicated by the code. For example:
- If the code points to a loose gas cap, tighten it or replace it.
- If it’s an oxygen sensor issue, you may need to replace the sensor (usually located in the exhaust manifold).
- If it’s a misfire, check spark plugs, ignition coils, or fuel injectors.
Use your owner’s manual or online resources to find the correct part locations and repair procedures for your Infiniti M35. If you’re unsure, consult a trusted mechanic.
Step 6: Clear the Codes and Reset the Light
Once the issue is fixed, return to the scanner and select the option to “Clear Codes” or “Reset MIL.” The scanner will send a command to your car’s computer to erase the stored trouble codes and turn off the check engine light. Wait for confirmation on the screen—usually a message like “Codes Cleared” or “MIL Off.”
Step 7: Verify the Reset
Turn off the ignition, wait 10–15 seconds, then turn it back on. The check engine light should remain off. If it comes back on immediately, the problem may not be fully resolved, or a new issue has occurred. Re-scan the system to check for additional codes.
For best results, drive your Infiniti M35 for a short trip (10–15 minutes) to allow the computer to run its self-tests. This ensures all systems are functioning properly and the light stays off.
Method 2: Disconnecting the Battery (Manual Reset)
If you don’t have an OBD2 scanner, you can try resetting the engine light by disconnecting the car battery. This method forces the car’s computer to reset, clearing temporary codes and turning off the light. However, it’s less precise than using a scanner and may not work for all issues.
Step 1: Turn Off the Ignition
Make sure the car is completely off. Remove the key from the ignition and wait a few minutes to let the electrical system power down.
Step 2: Locate the Battery
In the Infiniti M35, the battery is located in the engine bay on the driver’s side. Open the hood and look for a black plastic cover—lifting it reveals the battery terminals.
Step 3: Disconnect the Negative Terminal
Use a wrench or socket to loosen the nut on the negative (black) battery terminal. Carefully remove the cable and tuck it away from the battery to prevent accidental contact. Wait at least 15 minutes—this gives the car’s computer time to fully reset.
Step 4: Reconnect the Battery
After waiting, reattach the negative cable and tighten the nut securely. Make sure the connection is tight to avoid electrical issues.
Step 5: Turn on the Ignition
Turn the key to the “ON” position and check the dashboard. The check engine light should be off. If it remains on, the problem may still exist, or the reset didn’t work.
Note: Disconnecting the battery may also reset other systems, such as the radio presets, clock, and seat memory. You may need to re-enter your radio code (found in the owner’s manual) and adjust settings.
Method 3: The Gas Pedal Trick (Infiniti-Specific)
Some Infiniti owners report success with a manual reset method involving the gas pedal. This technique is rumored to work on certain Nissan and Infiniti models, including the M35, by triggering a reset sequence in the engine control unit (ECU).
Step 1: Ensure the Car Is Off
Make sure the ignition is off and the key is removed. The car should be completely powered down.
Step 2: Press the Gas Pedal
Press the accelerator pedal all the way to the floor and hold it down for 5–10 seconds. Then release it completely.
Step 3: Repeat the Process
Repeat the press-and-hold action three times, with a 5-second pause between each press. After the third press, leave the pedal released.
Step 4: Turn on the Ignition
Turn the key to the “ON” position (do not start the engine). Watch the dashboard—the check engine light should flash or turn off. If it does, the reset may have worked.
Caution: This method is not officially supported by Infiniti and may not work on all M35 models or years. It’s best used as a last resort or for minor glitches. Always follow up with an OBD2 scan to confirm the issue is resolved.
Troubleshooting Common Issues
Even after resetting the engine light, you may encounter problems. Here’s how to handle common scenarios:
The Light Comes Back On
If the check engine light returns shortly after resetting, the original issue likely wasn’t fixed. Re-scan the system with an OBD2 scanner to check for new or recurring codes. Persistent codes often indicate a deeper problem, such as a failing catalytic converter, fuel system issue, or electrical fault.
Multiple Codes Appear
Sometimes, one problem triggers multiple codes. For example, a misfire (P0300) can lead to catalytic converter damage (P0420). Address the root cause first—fix the misfire—and the other codes may clear on their own after a few drive cycles.
Scanner Won’t Connect
If your OBD2 scanner fails to communicate with the car, check the following:
- Is the ignition turned to “ON”?
- Is the scanner properly plugged in?
- Is the OBD2 port damaged or dirty? Clean it with compressed air.
- Is the scanner compatible with your Infiniti M35? Most OBD2 scanners work with 1996 and newer vehicles.
Battery Reset Didn’t Work
If disconnecting the battery didn’t turn off the light, the issue may be more serious. Some problems, like a faulty mass airflow sensor or transmission issue, require professional diagnosis. Don’t keep resetting the light without fixing the cause.
Preventing Future Engine Light Warnings
The best way to avoid engine light problems is through regular maintenance. Here are some tips tailored to your Infiniti M35:
- Check the Gas Cap: A loose or damaged gas cap is the #1 cause of check engine lights. After filling up, make sure it’s tightened until you hear clicks.
- Change Spark Plugs: The M35’s V6 engine uses six spark plugs. Replace them every 60,000–100,000 miles to prevent misfires.
- Replace Air Filters: A dirty air filter reduces engine efficiency and can trigger sensors. Check it every 12,000 miles.
- Use Quality Fuel: Stick to top-tier gasoline to keep fuel injectors clean and prevent carbon buildup.
- Monitor Oil Levels: Low or dirty oil can cause engine strain. Check levels monthly and change oil every 5,000–7,500 miles.
- Schedule Regular Inspections: Have a mechanic inspect your M35 annually, especially the emissions and ignition systems.
By staying proactive, you’ll reduce the chances of unexpected engine light warnings and keep your Infiniti running like new.
When to See a Mechanic
While many engine light issues can be handled at home, some problems require professional help. Seek a certified mechanic if:
- The check engine light is flashing (indicating a severe misfire).
- You notice performance issues like rough idling, loss of power, or stalling.
- The light comes back on repeatedly after resetting.
- You’re uncomfortable performing repairs or lack the right tools.
- The diagnostic code points to complex systems like the transmission, catalytic converter, or ECU.
Infiniti M35 owners can visit an Infiniti dealership or a trusted independent shop with experience in luxury imports. They’ll have the right equipment and expertise to diagnose and fix advanced issues.
Conclusion
Resetting the engine light on your Infiniti M35 doesn’t have to be intimidating. With the right tools and knowledge, you can diagnose the problem, fix it, and clear the warning—all from your driveway. The OBD2 scanner method is the most reliable, but manual options like battery disconnection or the gas pedal trick can work in a pinch.
Remember, the engine light is there to protect your car. Always address the root cause before resetting, and don’t ignore persistent warnings. With regular maintenance and a little know-how, your Infiniti M35 will stay in top condition for years to come.
Now that you know how to reset engine light & Infiniti M35, you can tackle this common issue with confidence. Stay safe, stay informed, and enjoy the smooth ride your luxury sedan was designed to deliver.